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Bandgap engineering of PEDOT:PSS/rGO a hole transport layer for SiNWs hybrid solar cells

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Abstract

Silicon nanowire (SiNW) hybrid solar cell has been fabricated using PEDOT:PSS and rGO-PEDOT:PSS as the organic hole transport layer. The electrical characterization of the as-fabricated solar cell was done by both dark and photo J–V characteristic curves. Vertically aligned arrays of SiNWs have been synthesized by following the electroless metal-assisted chemical etching method, as confirmed by both the scanning electron microscopy and atomic force microscopy images. The structural properties of SiNWs, PEDOT:PSS and rGO-PEDOT:PSS were characterized with the help of X-ray diffraction and Raman characterization techniques. The bandgap of PEDOT:PSS comes out to be 1.77 eV as obtained from the UV–visible and photoluminescence spectra. In addition, the bandgap of PEDOT:PSS was 1.76 eV and for reduced graphene oxide (rGO) it was 0.04 eV, as obtained from the cyclic voltammetry curve. rGO-PEDOT:PSS heterojunction showed excellent J–V characteristic property in the dark and under the illumination of 1 sun. Hence the incorporation of rGO in PEDOT:PSS can improve the photovoltaic properties by increasing the conductivity of the hole transport layer, making a good interface between organic–inorganic heterojunction as well as by reducing the recombination of electron–hole pairs.

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Acknowledgement

We acknowledge Dr Ramdas Pai and Vasanthi Pai’s endowment fund for supporting financially to carry out this whole project work.

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Authors and Affiliations

  1. Centre for Materials Science and Nanotechnology, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Rangpo, 737136, India

    Rabina Bhujel & Sadhna Rai

  2. Department of Physics, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Rangpo, 737136, India

    Utpal Deka

  3. University Science Instrumentation Centre, University of North Bengal, Darjeeling, 734013, India

    Gautam Sarkar

  4. Department of Chemistry, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Rangpo, 737136, India

    Joydeep Biswas

  5. Department of Physics, National Institute of Technology, Imphal, 795004, India

    Bibhu P Swain

Authors
  1. Rabina Bhujel
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  2. Sadhna Rai
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  4. Gautam Sarkar
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  6. Bibhu P Swain
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Correspondence to Bibhu P Swain.

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Bhujel, R., Rai, S., Deka, U. et al. Bandgap engineering of PEDOT:PSS/rGO a hole transport layer for SiNWs hybrid solar cells. Bull Mater Sci 44, 72 (2021). https://doi.org/10.1007/s12034-021-02376-8

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  • DOI: https://doi.org/10.1007/s12034-021-02376-8

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